US PATENT SUBCLASS 348 / 593
.~.~.~.~ Artificial key generation

Current as of: June, 1999
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348 /   HD   TELEVISION

571  DF  IMAGE SIGNAL PROCESSING CIRCUITRY SPECIFIC TO TELEVISION {34}
578  DF  .~ Special effects {3}
584  DF  .~.~ Combining plural sources {7}
590  DF  .~.~.~ Specified details of key signal generation or processing {3}
593.~.~.~.~ Artificial key generation {3}
594  DF  .~.~.~.~.~> Wipes signal generator
595  DF  .~.~.~.~.~> Fades signal generator
596  DF  .~.~.~.~.~> Window signal generator (e.g., rectangle)

DEFINITION

Classification: 348/593

Artificial key generation

(under subclass 590) Subject matter including a circuitry for generating the mixing control signal without using one of the image signals which is combined.